I can't speak for GMG (or other sites) regional lockouts as I'm in the states. That, I'll admit is the one drawback of the Steam DRM, if you're not in the US of A, things are more likely to get a bit wonky.
Tommy said:
Picked up Left for Dead and L4D2 for 7.49 . Didn`t have any zombie shooters so I figured what the heck !
BTW Witcher 2 has 8 cards so I figure by playing the game one should get 4 and then trade for the other 4 . Jeez i`ve got 75 hours on W2 just on the Steam version alone .
Left 4 Dead 1 is superfluous now since Left 4 Dead 2 has all of its maps and characters imported and better gameplay/guns, but it's still nice to have. I recommend you play through all the maps singleplayer in Left 4 Dead 2 to get a feel for the game before touching multiplayer. I have 800 hours and can help you out if you (or anyone else) want to try out multiplayer
You want to play the maps in this order (this is 'canonically' how the storyline goes)
Left 4 Dead 1 Protagonists: Bill, Zoey, Louis, Francis
No Mercy
Crash Course
Death Toll
Dead Air
Blood Harvest
The Sacrifice
Left 4 Dead 2 Protagonists: Coach, Rochelle, Nick, Ellis
Dead Center
The Passing
Dark Carnival
Swamp Fever
Hard Rain
The Parish
"Cold Steam" is a non-canon semi-fanmade DLC starring L4D2 characters, play that whenever you wish.